GPT-5.6 Terra Pro API

GPT-5.6 Terra Pro is OpenAI’s GPT-5.6 Terra model run in pro reasoning mode for higher-quality responses on complex tasks.

Modalities: Image, TextText
In / Out price: $2.12/$12.7per 1M
Context window: 1.05M tokens
Released: Jul 9, 2026

GPT-5.6 Terra Pro overview

GPT-5.6 Terra Pro by OpenAI

Same model as GPT-5.6 Terra, run with reasoning mode set to pro for harder requests. 1,050,000-token context, 128,000-token output, function calling, structured outputs.

GPT-5.6 Terra Pro specs

Model ID: openai/gpt-5.6-terra-pro
Developer: OpenAI
Context window: 1,050,000 tokens
Max output: 128,000 tokens
Input: Image, Text
Output: Text
API: OpenAI-compatible, base URL https://api.aimlapi.com/v1

What Is GPT-5.6 Terra Pro API?

GPT-5.6 Terra Pro is described as OpenAI's higher-effort reasoning configuration of GPT-5.6 Terra, using the same underlying model with reasoning mode set to pro for higher-quality responses on complex tasks.

OpenAI’s documentation also says pro mode can improve reliability on difficult tasks and is enabled by keeping the selected GPT-5.6 model while setting the reasoning mode to pro.

Technical Reference

Developer	Open AI
Model ID	openai/gpt-5.6-terra-pro
Release Date	July 8, 2026
Context Window	1,050,000 tokens (~1.1M)
Max Output Tokens	128,000 tokens
Modalities	Image, Text → Text
Capabilities	file input, parallel tool calls, reasoning, streaming, structured (JSON schema) output, tool/function calling, vision

What GPT-5.6 Terra Pro Brings to the Table

Same underlying model
GPT-5.6 Terra Pro is described as the same underlying model as GPT-5.6 Terra, with pro reasoning mode applied.

Higher-quality responses
The model is positioned for higher-quality responses on complex tasks.

Pro mode behavior
OpenAI says pro mode performs more model work to improve reliability on difficult tasks and returns a single final answer.

Execution mode, not a separate checkpoint
OpenAI guidance says pro mode is an execution mode applied to the selected GPT-5.6 model rather than a separate Pro model slug.

Where GPT-5.6 Terra Pro Makes the Most Sense

Complex tasks
Use it for difficult tasks where higher reliability matters.

Deep analysis
OpenAI recommends pro mode for deep analysis with clear evaluation criteria.

High-value coding or review
OpenAI guidance lists complex optimization and high-value coding or review as suitable uses for pro mode.

Longer-running workflows
OpenAI’s GPT-5.6 preview materials describe Pro variants as aimed at difficult tasks and longer-running workflows.

GPT-5.6 Terra Pro vs the Alternatives

GPT-5.6 Terra
OpenAI describes GPT-5.6 Terra as the base model that Terra Pro uses with pro reasoning mode.

GPT-5.6 Sol Pro
OpenAI’s help center describes Sol Pro as the highest-capability GPT-5.6 option for difficult tasks and longer-running workflows.

Sources: https://openai.com/index/gpt-5-6/ · https://openrouter.ai/openai/gpt-5.6-terra-pro · https://developer.puter.com/ai/openai/gpt-5.6-terra-pro/

Use cases

Long-document analysis and document review are documented as fit areas for GPT-5.6 Terra Pro, including parsing handwritten memos and performing extraction for later analysis.

High-volume business tasks are another stated use case, with examples such as customer support, internal tools, and document analysis.

Multimodal agentic workflows are also described, combining vision, web search, and tool calling for production work.

Deeper reasoning on complex tasks is a further documented fit, especially where improved accuracy and solution quality matter more than speed or cost.

Capabilities

File input
Reasoning
Streaming
Vision

GPT-5.6 Terra Pro API pricing

GPT-5.6 Terra Pro pricing in US dollars
Usage	Price	Unit
Input	$2.12	1M tokens
Output	$12.7	1M tokens
Cached input	$0.2116	1M tokens

Prices from the AI/ML API price list, checked on Nov 4, 2026.

GPT-5.6 Terra Pro vs other models: token prices

AI/ML API input and output rates for 5 models, per million tokens.

AI/ML API model prices in USD per million tokens
Model	Input	Output
GPT-5.6 Terra Pro	$2.12	$12.7
GPT-6 Luna	$0.1	$0.5
GPT-6.1 Terra	$1	$5
GPT-6.1 Sol	$2	$10
GPT-6.1 Terra Pro	$2.12	$10.58

How to use the GPT-5.6 Terra Pro API

View docs

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key

export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl 'https://api.aimlapi.com/v1/chat/completions' \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "openai/gpt-5.6-terra-pro",
  "messages": [
    {
      "role": "user",
      "content": "Write a haiku about the ocean."
    }
  ]
}'

import os
import requests

headers = {
    "Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
    "Content-Type": "application/json",
}
payload = {
    "model": "openai/gpt-5.6-terra-pro",
    "messages": [
        {
            "role": "user",
            "content": "Write a haiku about the ocean."
        }
    ]
}

response = requests.post("https://api.aimlapi.com/v1/chat/completions", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())

const response = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "openai/gpt-5.6-terra-pro",
    "messages": [
      {
        "role": "user",
        "content": "Write a haiku about the ocean."
      }
    ]
  }),
});

if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());

GPT-5.6 Terra Pro FAQ

What is the context window of GPT-5.6 Terra Pro?

GPT-5.6 Terra Pro has a 1,050,000 tokens context window and can return up to 128,000 tokens.

What inputs and outputs does GPT-5.6 Terra Pro support?

GPT-5.6 Terra Pro takes image, text as input and returns text.

What is the model ID for GPT-5.6 Terra Pro?

Use openai/gpt-5.6-terra-pro as the model id. Requests go to https://api.aimlapi.com/v1/chat/completions.

When was GPT-5.6 Terra Pro released?

GPT-5.6 Terra Pro became available on July 9, 2026.

How much does GPT-5.6 Terra Pro cost?

GPT-5.6 Terra Pro costs $2.12 input and $12.7 output per 1M tokens on AI/ML API, billed as you go with no subscription.

Does GPT-5.6 Terra Pro support streaming?

Yes, GPT-5.6 Terra Pro can stream responses as they are generated.

Can GPT-5.6 Terra Pro read images?

Yes, GPT-5.6 Terra Pro accepts image input alongside text.

Who created GPT-5.6 Terra Pro?

GPT-5.6 Terra Pro was built by OpenAI.

Start building with GPT-5.6 Terra Pro

Get API key

GPT-5.6 Terra Pro API

openai/gpt-5.6-terra-pro

Build with your agent

Give your agent the model details, code and documentation.

1Get your API key

Create API key

export AIMLAPI_KEY="8f2b4c7d9a1e6b3f…"

2Make your first request

curl 'https://api.aimlapi.com/v1/chat/completions' \
  -H "Authorization: Bearer $AIMLAPI_KEY" \
  -H 'Content-Type: application/json' \
  -d '{
  "model": "openai/gpt-5.6-terra-pro",
  "messages": [
    {
      "role": "user",
      "content": "Write a haiku about the ocean."
    }
  ]
}'

import os
import requests

headers = {
    "Authorization": f"Bearer {os.environ['AIMLAPI_KEY']}",
    "Content-Type": "application/json",
}
payload = {
    "model": "openai/gpt-5.6-terra-pro",
    "messages": [
        {
            "role": "user",
            "content": "Write a haiku about the ocean."
        }
    ]
}

response = requests.post("https://api.aimlapi.com/v1/chat/completions", headers=headers, json=payload, timeout=120)
response.raise_for_status()
print(response.json())

const response = await fetch("https://api.aimlapi.com/v1/chat/completions", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.AIMLAPI_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "model": "openai/gpt-5.6-terra-pro",
    "messages": [
      {
        "role": "user",
        "content": "Write a haiku about the ocean."
      }
    ]
  }),
});

if (!response.ok) throw new Error(`HTTP ${response.status}`);
console.log(await response.json());

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GPT-5.6 Terra Pro API

GPT-5.6 Terra Pro overview

GPT-5.6 Terra Pro by OpenAI

GPT-5.6 Terra Pro specs

What Is GPT-5.6 Terra Pro API?

Technical Reference

What GPT-5.6 Terra Pro Brings to the Table

Where GPT-5.6 Terra Pro Makes the Most Sense

GPT-5.6 Terra Pro vs the Alternatives

Use cases

Capabilities

GPT-5.6 Terra Pro API pricing

GPT-5.6 Terra Pro vs other models: token prices

How to use the GPT-5.6 Terra Pro API

Build with your agent

1Get your API key

2Make your first request

GPT-5.6 Terra Pro FAQ

Start building with GPT-5.6 Terra Pro

GPT-5.6 Terra Pro API

Build with your agent

1Get your API key

2Make your first request

GPT-5.6 Terra Pro API

GPT-5.6 Terra Pro overview

GPT-5.6 Terra Pro by OpenAI

GPT-5.6 Terra Pro specs

What Is GPT-5.6 Terra Pro API?

Technical Reference

What GPT-5.6 Terra Pro Brings to the Table

Where GPT-5.6 Terra Pro Makes the Most Sense

GPT-5.6 Terra Pro vs the Alternatives

Use cases

Capabilities

GPT-5.6 Terra Pro API pricing

GPT-5.6 Terra Pro vs other models: token prices

How to use the GPT-5.6 Terra Pro API

Build with your agent

1Get your API key

2Make your first request

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